A thin layer of gasoline floating on water appears brightly colored in sunlight. From where do the colors come?
1..the interference of light waves reflected from the opposite surfaces of the gasoline film
2.the interference of the various wavelengths of sunlight reflected at the airāgasoline boundary
3.the interference of light waves of similar frequencies created by the dispersion of the sunlight by the gasoline film
4.the interference of light waves refracted by the opposite surfaces of the gasoline film
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